FORT BRAGG – Train tunnel No. 1 on the old California Western Railroad has endured a lot of punishment since it was hacked out of the serpentine and metasandstone rock east of Fort Bragg by Chinese and Italian laborers a century ago.

Sometime overnight between April 12 and 13, a 40-foot length of the tunnel collapsed for reasons still unexplained, dumping thousands of tons of rock onto the track, rubble that Skunk Train officials say they cannot afford to remove.